1 Corinthians 9:12

9:12 If others receive this right from you, are we not more deserving?

But we have not made use of this right. Instead we endure everything so that we may not be a hindrance to the gospel of Christ.

1 Corinthians 9:18

9:18 What then is my reward? That when I preach the gospel I may offer the gospel free of charge, and so not make full use of my rights in the gospel.